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1 SECTION _HYDRONIC PIPING SYSTEMS ABOVE GRADE PART 1 GENERAL 1.1 SUMMARY University Contact: Energy & Engineering Group (302) This standard includes hydronic piping requirements for both chilled water and heating hot water at buildings either served by district heating or standalone. The intent of these standards are to provide input to the design team on the University s preference of manufacturers, design, equipment options and quality assurance to maintain the longevity of its assets. 1.2 REFERENCES Common Work for HVAC Systems Common Requirements for HVAC Systems Identification of HVAC Piping & Equipment HVAC Insulation Hydronic Piping Systems Below Grade Hydronic Pumps DESIGN REQUIREMENTS All vents, air release valves, balancing valves and drains shall be shown on drawings. Drain valves shall be included at main shut off valves, at the branch shut-off valves, low points, bases of vertical risers and at all terminal equipment. Manual and auto air vents shall be included at all high points in the hydronic systems. All drain valves shall be full port ball valves with hose end connection Risers shall have isolation valves between each floor and at each floor branch. All take offs from mains shall have isolation valves All heating and cooling makeup systems shall include a bronze water meter with reporting capability to the BAS and energy Monitoring Systems. See domestic water piping systems standard (section ) for acceptable water meters HYDRONIC PIPING SYSTEMS ABOVE GRADE Page 1
2 1.3.4 Secondary chilled water systems shall be hydraulically decoupled from the primary system. All hydraulic decouplers shall include primary and secondary supply and return temperature sensors, RTD type. All hydraulic de-couplers shall have a flow meter in the primary chilled water return. Flow meter shall report through the BAS All branch take offs from piping mains are required to have shut off valves at the take offs so that repairs can be performed on the branch piping without shutting down the system All chilled water service shall include local BTU meters with outputs reporting to the BAS and totalized pulse reporting to energy monitoring system All manual balancing valves shall be standalone, not combination type, and have a memory setting feature All hydronic systems shall be variable flow. All hydronic pumps shall have variable frequency drives. Flow through hydronic coils shall be controlled by two way modulating control valves. Consulting engineer is responsible for maintaining pump minimum flow requirements Heating water systems shall have water treatment including a chemical bypass feeder. Chemical by-pass feeder piping shall include provisions to temporarily install a side stream media filter All hydronic piping utilities entering and exiting a building shall have a double block and bleed valve configuration Pipe routed exterior to the building and above grade shall be electrically heat traced with current monitoring through BAS University of Delaware requires that shell and tube heat exchangers shall be used in hydronic heating and cooling systems. The use of plate and frame heat require a variance from the University Energy and Engineering group. 1.4 SUBMITTALS Submit isometric piping fabrication drawings of the following: A. Air handling unit coil connections, including all related valves and instruments. B. Heat exchanger connections including all related valves and instruments HYDRONIC PIPING SYSTEMS ABOVE GRADE Page 2
3 1.5 CLOSE-OUT SUBMITTALS Balancing report Hydrostatic Test Report As-built drawings 1.6 QUALITY ASSURANCE Verify field measurements prior to fabrication Pressure test must comply with ASME B Pressure test must be witnessed by a representative designated by the University of Delaware After completion, flush all hydronic piping systems with clean water until all grease, weld slag and metal filings are removed from system. 1.7 DELIVERY, STORAGE AND HANDLING Furnish temporary end caps and closures on pipe and fittings. Maintain in place until installation Protect piping from entry of foreign materials by temporary covers, completing sections of the Work and isolating parts of the completed system. PART 2 PRODUCTS 2.1 The University of Delaware will entertain all relevant materials for hydronic piping systems. 2.2 If copper tubing is used it must be ASTM B280 Type K hard drawn. All copper fittings shall be wrought copper and comply with ASME B16. All joints larger than 2 shall be brazed If steel pipe is used it must be Schedule 40 or greater 2.4 All fittings shall be threaded, socket weld or butt weld type and Conform to ASME B31.9. All joints larger than 2 diameter shall be welded. All threaded steel pipe less than 2 shall be schedule HYDRONIC PIPING SYSTEMS ABOVE GRADE Page 3
4 2.4 For hydronic piping less than 200 degrees Fahrenheit (including chilled water), all isolation valves 6 and larger shall be resilient seat butterfly valves, tripled sealed, hard backed cartridge seat, wafer body, S.S. disc, EPDM seal, Cameron, DeZurick, ABZ. Gear operators are required for incoming service. 2.5 For hydronic piping less than 200 degrees Fahrenheit (including chilled water), all isolation valves 2-1/2 to 4 shall be flanged three piece bronze full port ball valves with Teflon seats and stainless steel ball and trim. 2.6 For hydronic hot water service over 200 degrees Fahrenheit use High Performance butterfly valves such as ABZ with Teflon seat/seal, 17/4PH stainless stem, 316SS disc, or equivalent by Dezurik and Milwaukee (same materials of Construction). 2.7 For all hydronic services, isolation valves 2 inches in diameter and smaller shall be two piece, Teflon seated, bronze, full port, w/ stainless steel trim, ball valves. American, Apollo, Milwaukee and Nibco are acceptable valve manufacturers. 2.8 Dirt/air eliminators, when applied, shall be manufactured by Spirotherm. All units(where applicable) shall include a full port ball valve at the bottom blow down connection and be piped to a Rosedale filter (see attachment 1). 2.9 In-line wye strainers shall be manufactured by spirax sarco with stainless steel baskets, bolted cover and plugged blow-off. 2.9 BTU meters to be Onicon System Flow meters to be Onicon insertion magnetic meter or full insertion mag meter depending on the metering run available All balancing valves shall be Tour Andersson, Armstrong and B&G 2.12 Pump check valves shall be silent type, stainless steel trim w/ viton seats By-pass chemical filter feeders shall be 5 gallon, filter feeder type, FTF-5DB equipped w/ 10 micron filter bags, qty ten (10) Thermometers to be liquid filled thermometer type, 90 degree angle, w/ well, equal to Trerice, Model HT 31, range code 41 for chilled water and range code 47 for hot heating water All pressure gages shall be liquid filled. Pressure gages shall be accurate to within plus or minus one percent of range span, stainless steel bourdon-tube system, bronze movement, a dial diameter of 4 to 5 is acceptable when installed 8 feet or less above finished floor, 8 dial diameter when installed higher than 8 feet above finished floor HYDRONIC PIPING SYSTEMS ABOVE GRADE Page 4
5 Each gage connection shall have a full port ball valve for isolation Differential Pressure Indicator, DPI, for by-chemical chemical filter feeder shall be Midwest Instrument, Model Expansion tanks shall be floor mounted diaphragm type (fluid in diaphragm), replaceable diaphragm, all welded steel, constructed, tested and stamped in accordance with ASME, and rated for a minimum working pressure of 125 psig. Only vertical expansion tanks with integral steel support stand are acceptable to the University of Delaware. Expansion tank shall be supplied with an air-charging fitting and tank drain. Connection to the unit shall have a valve and union for service replacement Heat exchangers for HVAC heating and cooling systems shall be shell and tube constructed, tested and stamped in accordance with ASME and rated for a minimum working pressure of 125 psig. Tubes shall be U-type with ¾ minimum cupro-nickel tubes. Shell shall be carbon steel with cast iron heads. PART 3 EXECUTION 3.1 All expansion loops shall be piped as hard type. 3.2 Install non-conducting dielectric connections wherever jointing dissimilar metals. All connections shall use dielectric nipples, couplings or insulating flanges. No dielectric unions allowed. 3.3 Install piping to allow for expansion and contraction without stressing pipe, joints and/or connected equipment wherever possible group piping at common elevations Provide clearance in hangers and from structure to allow for installation of insulation Provide flanged connections to all equipment. 3.7 Ensure, valve handles, test and balance ports are extended beyond the outside surface of the insulation for all chilled water services. 3.8 Primary bridge flow shall be balanced for peak building chilled water flow that equals the peak load. 3.9 Filter bags on by-pass chemical by-pass feeders will be in place and and maintained by 10 5 psid following cleaning and flushing of piping systems HYDRONIC PIPING SYSTEMS ABOVE GRADE Page 5
6 3.10 Set point for VFD shall be determined by the balancer placing all coils at peak flow that equals peak load and measuring the most remote coil s differential pressure w/ valves wide open. END OF SECTION ATTACHMENT 1: DIRT/AIR ELIMINATOR PIPING ARRANGEMENT HYDRONIC PIPING SYSTEMS ABOVE GRADE Page 6
7 ATTACHMENT 1 DIRT/AIR ELIMINATOR PIPING ARRANGEMENT HYDRONIC PIPING SYSTEMS ABOVE GRADE Page 7
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